US8488564B2ActiveUtilityPatentIndex 42
Method and device for mapping a codeword to a layer in a multi-input multi-output system
Est. expiryJan 21, 2029(~2.6 yrs left)· nominal 20-yr term from priority
H04L 1/06
42
PatentIndex Score
0
Cited by
9
References
11
Claims
Abstract
The present invention discloses a method for mapping a codeword to a layer in a multi-input multi-output system, the method includes: grouping current layers in a multi-input multi-output system according to the number of current codewords, and mapping each codeword to the layer of a group to which the codeword corresponds. The present invention further discloses a device for mapping a codeword to a layer in a multi-input multi-output system, the device includes: a layer grouping unit and a mapping unit, wherein the layer grouping unit is used for grouping current layers in a multi-input multi-output system according to the number of current codewords; and the mapping unit is used for mapping each codeword to the layer of a group to which the codeword corresponds. The present invention is easy to be implemented, and the mapping manner for mapping a codeword to a layer is more reasonable.
Claims
exact text as granted — not AI-modifiedThe invention claimed is:
1. A method for mapping a codeword to a layer in a multi-input multi-output system, comprising:
grouping current layers in a multi-input multi-output system according to a number of current codewords, and mapping each codeword to a layer in a group to which the codeword corresponds, wherein a number of the current layers in the multi-input multi-output system is 4 or more than 4; the number of layers supported by the multi-input multi-output system is 8 at most;
under the condition that the number of the current codewords is 2, when the number of the current layers in the multi-input multi-output system is 6, after the grouping, the numbers of layers in each group are 3, 3 respectively; when the number of the current layers in the multi-input multi-output system is 8, after the grouping, the numbers of layers in each group are 4, 4 respectively; when the number of the current layers in the multi-input multi-output system is 5, after the grouping, the numbers of layers in each group are 2, 3 respectively; and when the number of the current layers in the multi-input multi-output system is 7, after the grouping, the numbers of layers in each group are 3, 4 respectively.
2. The method according to claim 1 , wherein under the condition that the number of the current codewords is 4, when the number of the current layers in the multi-input multi-output system is 4, after the grouping, the numbers of layers in each group are 1, 1, 1, 1 respectively; when the number of the current layers in the multi-input multi-output system is 5, after grouping, the numbers of layers in each group are 1, 1, 1, 2 respectively; when the number of the current layers in the multi-input multi-output system is 6, the numbers of layers in each group are 1, 1, 2, 2 respectively; when the number of the current layers in the multi-input multi-output system is 7, after the grouping, the numbers of layers in each group are 1, 2, 2, 2 respectively; and when the number of the current layers in the multi-input multi-output system is 8, after the grouping, the numbers of layers in each group are 2, 2, 2, 2 respectively;
bits of each codeword is modulated into codeword symbols according to a preset encoding mode, and the modulation symbols for a codeword are mapped to a layer in the group; and when each codeword is mapped to two layers or to more than two layers, the codeword symbols in each codeword is mapped to each layer in the group in a polling manner.
3. The method according to claim 1 , wherein the codeword symbols are mapped to a layer in the group, specifically:
a mapping relationship of transmission diversity is as follows:
when the number of layers is 5:
x
(
0
)
(
i
)
=
d
(
0
)
(
5
i
)
,
x
(
1
)
(
i
)
=
d
(
0
)
(
5
i
+
1
)
,
x
(
2
)
(
i
)
=
d
(
0
)
(
5
i
+
2
)
,
x
(
3
)
(
i
)
=
d
(
0
)
(
5
i
+
3
)
,
x
(
4
)
(
i
)
=
d
(
0
)
(
5
i
+
4
)
;
when the number of layers is 6:
x
(
0
)
(
i
)
=
d
(
0
)
(
6
i
)
,
x
(
1
)
(
i
)
=
d
(
0
)
(
6
i
+
1
)
,
x
(
2
)
(
i
)
=
d
(
0
)
(
6
i
+
2
)
,
x
(
3
)
(
i
)
=
d
(
0
)
(
6
i
+
3
)
,
x
(
4
)
(
i
)
=
d
(
0
)
(
6
i
+
4
)
,
x
(
5
)
(
i
)
=
d
(
0
)
(
6
i
+
5
)
;
when the number of layers is 7:
x
(
0
)
(
i
)
=
d
(
0
)
(
7
i
)
,
x
(
1
)
(
i
)
=
d
(
0
)
(
7
i
+
1
)
,
x
(
2
)
(
i
)
=
d
(
0
)
(
7
i
+
2
)
,
x
(
3
)
(
i
)
=
d
(
0
)
(
7
i
+
3
)
,
x
(
4
)
(
i
)
=
d
(
0
)
(
7
i
+
4
)
,
x
(
5
)
(
i
)
=
d
(
0
)
(
7
i
+
5
)
,
x
(
6
)
(
i
)
=
d
(
0
)
(
7
i
+
6
)
;
when the number of layers is 8:
x
(
0
)
(
i
)
=
d
(
0
)
(
8
i
)
,
x
(
1
)
(
i
)
=
d
(
0
)
(
8
i
+
1
)
,
x
(
2
)
(
i
)
=
d
(
0
)
(
8
i
+
2
)
,
x
(
3
)
(
i
)
=
d
(
0
)
(
8
i
+
3
)
,
x
(
4
)
(
i
)
=
d
(
0
)
(
8
i
+
4
)
,
x
(
5
)
(
i
)
=
d
(
0
)
(
8
i
+
5
)
,
x
(
6
)
(
i
)
=
d
(
0
)
(
8
i
+
6
)
,
x
(
7
)
(
i
)
=
d
(
0
)
(
8
i
+
7
)
;
wherein the modulation symbols for a codeword q are d (q) (0), . . . , d (q) (M symb (q) −1), M symb (q) represents the number of the modulation symbols for the codeword q; the symbols mapped to a layer ν are x (ν) (0), . . . , x (ν)( 0), . . . , x (ν) (M symb layer −1), M symb layer represents the number of the modulation symbols per layer.
4. The method according to claim 1 , wherein the codeword symbols are mapped to a layer in the group, specifically:
under the condition that the number of codewords is 2:
when the number of layers is 5:
x
(
0
)
(
i
)
=
d
(
0
)
(
2
i
)
x
(
1
)
(
i
)
=
d
(
0
)
(
2
i
+
1
)
,
x
(
2
)
(
i
)
=
d
(
1
)
(
3
i
)
x
(
3
)
(
i
)
=
d
(
1
)
(
3
i
+
1
)
x
(
4
)
(
i
)
=
d
(
1
)
(
3
i
+
2
)
;
when the number of layers is 6:
x
(
0
)
(
i
)
=
d
(
0
)
(
3
i
)
x
(
1
)
(
i
)
=
d
(
0
)
(
3
i
+
1
)
x
(
2
)
(
i
)
=
d
(
0
)
(
3
i
+
2
)
,
x
(
3
)
(
i
)
=
d
(
1
)
(
3
i
)
x
(
4
)
(
i
)
=
d
(
1
)
(
3
i
+
1
)
x
(
5
)
(
i
)
=
d
(
1
)
(
3
i
+
2
)
;
when the number of layers is 7:
x
(
0
)
(
i
)
=
d
(
0
)
(
3
i
)
x
(
1
)
(
i
)
=
d
(
0
)
(
3
i
+
1
)
x
(
2
)
(
i
)
=
d
(
0
)
(
3
i
+
2
)
,
x
(
3
)
(
i
)
=
d
(
1
)
(
4
i
)
x
(
4
)
(
i
)
=
d
(
1
)
(
4
i
+
1
)
x
(
5
)
(
i
)
=
d
(
1
)
(
4
i
+
2
)
x
(
6
)
(
i
)
=
d
(
1
)
(
4
i
+
3
)
;
when the number is layers is 8:
x
(
0
)
(
i
)
=
d
(
0
)
(
4
i
)
x
(
1
)
(
i
)
=
d
(
0
)
(
4
i
+
1
)
x
(
2
)
(
i
)
=
d
(
0
)
(
4
i
+
2
)
x
(
3
)
(
i
)
=
d
(
0
)
(
4
i
+
3
)
,
x
(
4
)
(
i
)
=
d
(
1
)
(
4
i
)
x
(
5
)
(
i
)
=
d
(
1
)
(
4
i
+
1
)
x
(
6
)
(
i
)
=
d
(
1
)
(
4
i
+
2
)
x
(
7
)
(
i
)
=
d
(
1
)
(
4
i
+
3
)
;
wherein the modulation symbols for a codeword q are d (q) (0), . . . , d (q) (0)(M symb (q) −1), M symb (q) represents the number of the modulation symbols for the codeword q; the symbols mapped to a layer ν are x (ν) , . . . , x (ν) (M symb layer −1), M symb layer represents the number of the modulation symbols per layer.
5. The method according to claim 4 , wherein when the numbers of the codeword symbols mapped to each layer are different, a null codeword symbol or more are added to the end of the codeword symbols, so that the numbers of codeword symbols mapped to each layer are the same.
6. The method according to claim 1 , wherein the codeword symbols are mapped to a layer in the group, specifically:
under the condition that the number of codewords is 4:
when the number of layers is 4:
x
(
0
)
(
i
)
=
d
(
0
)
(
i
)
,
x
(
1
)
(
i
)
=
d
(
1
)
(
i
)
,
x
(
2
)
(
i
)
=
d
(
2
)
(
i
)
,
x
(
3
)
(
i
)
=
d
(
3
)
(
i
)
;
when the number of layers is 5:
x
(
0
)
(
i
)
=
d
(
0
)
(
i
)
,
x
(
1
)
(
i
)
=
d
(
1
)
(
i
)
,
x
(
2
)
(
i
)
=
d
(
2
)
(
i
)
,
x
(
3
)
(
i
)
=
d
(
3
)
(
2
i
)
x
(
4
)
(
i
)
=
d
(
3
)
(
2
i
+
1
)
;
when the number of layers is 6:
x
(
0
)
(
i
)
=
d
(
0
)
(
i
)
,
x
(
1
)
(
i
)
=
d
(
1
)
(
i
)
,
x
(
3
)
(
i
)
=
d
(
3
)
(
2
i
)
x
(
4
)
(
i
)
=
d
(
3
)
(
2
i
+
1
)
x
(
2
)
(
i
)
=
d
(
2
)
(
2
i
)
x
(
3
)
(
i
)
=
d
(
2
)
(
2
i
+
1
)
,
x
(
4
)
(
i
)
=
d
(
3
)
(
2
i
)
x
(
5
)
(
i
)
=
d
(
3
)
(
2
i
+
1
)
;
when the number of layers is 7:
x
(
0
)
(
i
)
=
d
(
0
)
(
i
)
,
x
(
1
)
(
i
)
=
d
(
1
)
(
2
i
)
x
(
2
)
(
i
)
=
d
(
1
)
(
2
i
+
1
)
,
x
(
3
)
(
i
)
=
d
(
2
)
(
2
i
)
x
(
4
)
(
i
)
=
d
(
2
)
(
2
i
+
1
)
,
x
(
5
)
(
i
)
=
d
(
3
)
(
2
i
)
x
(
6
)
(
i
)
=
d
(
3
)
(
2
i
+
1
)
;
when the number of layers is 8:
x
(
0
)
(
i
)
=
d
(
0
)
(
2
i
)
x
(
1
)
(
i
)
=
d
(
0
)
(
2
i
+
1
)
,
x
(
2
)
(
i
)
=
d
(
1
)
(
2
i
)
x
(
3
)
(
i
)
=
d
(
1
)
(
2
i
+
1
)
,
x
(
4
)
(
i
)
=
d
(
2
)
(
2
i
)
x
(
5
)
(
i
)
=
d
(
2
)
(
2
i
+
1
)
,
x
(
6
)
(
i
)
=
d
(
3
)
(
2
i
)
x
(
7
)
(
i
)
=
d
(
3
)
(
2
i
+
1
)
;
wherein the modulation symbols for a codeword q are d (q) (0), . . . , d (q) (M symb (q) −1), M symb (q) represents the number of the modulation symbols for the codeword q; the symbols mapped to a layer ν are x (ν) (0), . . . , x (ν) (M symb layer −1), M symb layer represents the number of the modulation symbols per layer.
7. The method according to claim 6 , wherein when the numbers of the codeword symbols mapped to each layer are different, a null codeword symbol or more are added to the end of the codeword symbols, so that the numbers of codeword symbols mapped to each layer are the same.
8. A device for mapping a codeword to a layer in a multi-input multi-output system, comprising a layer grouping unit and a mapping unit;
wherein the layer grouping unit is used for grouping current layers in a multi-input multi-output system according to a number of current codewords;
the mapping unit is used for mapping each codeword to a layer in a group to which the codeword corresponds;
wherein a number of the current layers in the multi-input multi-output system is 4 or more than 4; the number of layers supported by the multi-input multi-output system is 8 at most;
under the condition that the number of the current codewords is 2, when the number of the current layers in the multi-input multi-output system is 6, after the layer grouping unit completes the grouping, the numbers of layers in each group are 3, 3 respectively; when the number of the current layers in the multi-input multi-output system is 8, after the layer grouping unit completes the grouping, the numbers of layers in each group are 4, 4 respectively; when the number of the current layers in the multi-input multi-output system is 5, after the layer grouping unit completes the grouping, the numbers of layers in each group are 2, 3 respectively; and when the number of the current layers in the multi-input multi-output system is 7, after the layer grouping unit completes the grouping, the numbers of layers in each group are 3, 4 respectively;
the device further comprising: a modulating unit for modulating bits of each codeword into codeword symbols according to a preset encoding mode; and the mapping unit is further used for mapping modulation symbols for a single codeword to a layer in the group to which the codeword corresponds, and when modulation symbols for the single codeword is mapped to two layers or to more than two layers, the mapping unit is further used for mapping the codeword symbol in the single codeword to each layer in a polling manner.
9. The device according to claim 8 , wherein
under the condition that the number of codewords is 2:
when
the
number
of
layers
is
5
:
x
(
0
)
(
i
)
=
d
(
0
)
(
2
i
)
x
(
1
)
(
i
)
=
d
(
0
)
(
2
i
+
1
)
,
x
(
2
)
(
i
)
=
d
(
1
)
(
3
i
)
x
(
3
)
(
i
)
=
d
(
1
)
(
3
i
+
1
)
x
(
4
)
(
i
)
=
d
(
1
)
(
3
i
+
2
)
;
when
the
number
of
layers
is
6
:
x
(
0
)
(
i
)
=
d
(
0
)
(
3
i
)
x
(
1
)
(
i
)
=
d
(
0
)
(
3
i
+
1
)
x
(
2
)
(
i
)
=
d
(
0
)
(
3
i
+
2
)
,
x
(
3
)
(
i
)
=
d
(
1
)
(
3
i
)
x
(
4
)
(
i
)
=
d
(
1
)
(
3
i
+
1
)
x
(
5
)
(
i
)
=
d
(
1
)
(
3
i
+
2
)
;
when
the
number
of
layers
is
7
:
x
(
0
)
(
i
)
=
d
(
0
)
(
3
i
)
x
(
1
)
(
i
)
=
d
(
0
)
(
3
i
+
1
)
x
(
2
)
(
i
)
=
d
(
0
)
(
3
i
+
2
)
,
x
(
3
)
(
i
)
=
d
(
1
)
(
4
i
)
x
(
4
)
(
i
)
=
d
(
1
)
(
4
i
+
1
)
x
(
5
)
(
i
)
=
d
(
1
)
(
4
i
+
2
)
x
(
6
)
(
i
)
=
d
(
1
)
(
4
i
+
3
)
;
when
the
number
of
layers
is
8
:
x
(
0
)
(
i
)
=
d
(
0
)
(
4
i
)
x
(
1
)
(
i
)
=
d
(
0
)
(
4
i
+
1
)
x
(
2
)
(
i
)
=
d
(
0
)
(
4
i
+
2
)
x
(
3
)
(
i
)
=
d
(
0
)
(
4
i
+
3
)
,
x
(
4
)
(
i
)
=
d
(
1
)
(
4
i
)
x
(
5
)
(
i
)
=
d
(
1
)
(
4
i
+
1
)
x
(
6
)
(
i
)
=
d
(
1
)
(
4
i
+
2
)
x
(
7
)
(
i
)
=
d
(
1
)
(
4
i
+
3
)
;
wherein the modulation symbols for a codeword q are d (q) (0), . . . , d (q) (M symb (q) −1), M symb (q) represents the number of the modulation symbols for the codeword q; the symbols mapped to a layer ν are x (ν) (0), . . . , x (ν) (M symb layer −1), M symb layer represents the number of the modulation symbols per layer.
10. The device according to claim 8 , wherein
under the condition that the number of the current codewords is 4, when the number of the current layers in the multi-input multi-output system is 4, after the layer grouping unit completes the grouping, the numbers of layers in each group are 1, 1, 1, 1 respectively; when the number of the current layers in the multi-input multi-output system is 5, after the layer grouping unit completes the grouping, the numbers of layers in each group are 1, 1, 1, 2 respectively; when the number of the current layers in the multi-input multi-output system is 6, after the layer grouping unit completes the grouping, the numbers of layers in each group are 1, 1, 2, 2 respectively; when the number of the current layers in the multi-input multi-output system is 7, after the layer grouping unit completes the grouping, the numbers of layers in each group are 1, 2, 2, 2 respectively; and when the number of the current layers in the multi-input multi-output system is 8, after the layer grouping unit completes the grouping, the numbers of layers in each group are 2, 2, 2, 2 respectively;
under the condition that the number of codewords is 4:
when
the
number
of
layers
is
4
:
x
(
0
)
(
i
)
=
d
(
0
)
(
i
)
,
x
(
1
)
(
i
)
=
d
(
1
)
(
i
)
,
x
(
2
)
(
i
)
=
d
(
2
)
(
i
)
,
x
(
3
)
(
i
)
=
d
(
3
)
(
i
)
;
when
the
number
of
layers
is
5
:
x
(
0
)
(
i
)
=
d
(
0
)
(
i
)
,
x
(
1
)
(
i
)
=
d
(
1
)
(
i
)
,
x
(
2
)
(
i
)
=
d
(
2
)
(
i
)
,
x
(
3
)
(
i
)
=
d
(
3
)
(
2
i
)
x
(
4
)
(
i
)
=
d
(
3
)
(
2
i
+
1
)
;
when
the
number
of
layers
is
6
:
x
(
0
)
(
i
)
=
d
(
0
)
(
i
)
,
x
(
1
)
(
i
)
=
d
(
1
)
(
i
)
,
x
(
2
)
(
i
)
=
d
(
2
)
(
2
i
)
x
(
3
)
(
i
)
=
d
(
2
)
(
2
i
+
1
)
,
x
(
4
)
(
i
)
=
d
(
3
)
(
2
i
)
x
(
5
)
(
i
)
=
d
(
3
)
(
2
i
+
1
)
;
when
the
number
of
layers
is
7
:
x
(
0
)
(
i
)
=
d
(
0
)
(
i
)
,
x
(
1
)
(
i
)
=
d
(
1
)
(
2
i
)
x
(
2
)
(
i
)
=
d
(
1
)
(
2
i
+
1
)
,
x
(
3
)
(
i
)
=
d
(
2
)
(
2
i
)
x
(
4
)
(
i
)
=
d
(
2
)
(
2
i
+
1
)
,
x
(
5
)
(
i
)
=
d
(
3
)
(
2
i
)
x
(
6
)
(
i
)
=
d
(
3
)
(
2
i
+
1
)
;
when
the
number
of
layers
is
8
:
x
(
0
)
(
i
)
=
d
(
0
)
(
2
i
)
x
(
1
)
(
i
)
=
d
(
0
)
(
2
i
+
1
)
,
x
(
2
)
(
i
)
=
d
(
1
)
(
2
i
)
x
(
3
)
(
i
)
=
d
(
1
)
(
2
i
+
1
)
,
x
(
4
)
(
i
)
=
d
(
2
)
(
2
i
)
x
(
5
)
(
i
)
=
d
(
2
)
(
2
i
+
1
)
,
x
(
6
)
(
i
)
=
d
(
3
)
(
2
i
)
x
(
7
)
(
i
)
=
d
(
3
)
(
2
i
+
1
)
;
wherein the modulation symbols for a codeword q may d (q) (0), . . . , d (q) (M symb (q) −1), M symb (q) may represent the number of the modulation symbols for the codeword q, the symbols mapped to a layer ν may be x (ν) (0), . . . , x (ν) (M symb layer −1), M symb layer may represent the number of the modulation symbols per layer; and
when the numbers of the codeword symbols mapped to each layer are different, a null codeword symbol or more is added to the end of the codeword symbols, so that the numbers of codeword symbols mapped to each layer are the same.
11. The device according to claim 8 , wherein the mapping unit is further used for mapping the codeword symbols to a layer in the group to which the codeword) symbol corresponds, specifically:
a mapping relationship of transmission diversity being as follows:
when
the
number
of
layers
is
5
:
x
(
0
)
(
i
)
=
d
(
0
)
(
5
i
)
,
x
(
1
)
(
i
)
=
d
(
0
)
(
5
i
+
1
)
,
x
(
2
)
(
i
)
=
d
(
0
)
(
5
i
+
2
)
,
x
(
3
)
(
i
)
=
d
(
0
)
(
5
i
+
3
)
,
x
(
4
)
(
i
)
=
d
(
0
)
(
5
i
+
4
)
;
when
the
number
of
layers
is
6
:
x
(
0
)
(
i
)
=
d
(
0
)
(
6
i
)
,
x
(
1
)
(
i
)
=
d
(
0
)
(
6
i
+
1
)
,
x
(
2
)
(
i
)
=
d
(
0
)
(
6
i
+
2
)
,
x
(
3
)
(
i
)
=
d
(
0
)
(
6
i
+
3
)
,
x
(
4
)
(
i
)
=
d
(
0
)
(
6
i
+
4
)
,
x
(
5
)
(
i
)
=
d
(
0
)
(
6
i
+
5
)
;
when
the
number
of
layers
is
7
:
x
(
0
)
(
i
)
=
d
(
0
)
(
7
i
)
,
x
(
1
)
(
i
)
=
d
(
0
)
(
7
i
+
1
)
,
x
(
2
)
(
i
)
=
d
(
0
)
(
7
i
+
2
)
,
x
(
3
)
(
i
)
=
d
(
0
)
(
7
i
+
3
)
,
x
(
4
)
(
i
)
=
d
(
0
)
(
7
i
+
4
)
,
x
(
5
)
(
i
)
=
d
(
0
)
(
7
i
+
5
)
,
x
(
6
)
(
i
)
=
d
(
0
)
(
7
i
+
6
)
;
when
the
number
of
layers
is
8
:
x
(
0
)
(
i
)
=
d
(
0
)
(
8
i
)
,
x
(
1
)
(
i
)
=
d
(
0
)
(
8
i
+
1
)
,
x
(
2
)
(
i
)
=
d
(
0
)
(
8
i
+
2
)
,
x
(
3
)
(
i
)
=
d
(
0
)
(
8
i
+
3
)
,
x
(
4
)
(
i
)
=
d
(
0
)
(
8
i
+
4
)
,
x
(
5
)
(
i
)
=
d
(
0
)
(
8
i
+
5
)
,
x
(
6
)
(
i
)
=
d
(
0
)
(
8
i
+
6
)
,
x
(
7
)
(
i
)
=
d
(
0
)
(
8
i
+
7
)
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